Tool



H. BOLD TOOL Filed April 4, 1942 INVENTOR HERB ERT BOLD. (7M f1 Vm.

Novo 2, 1943.

Patented Nov. 2, 1943 einen UNITED STATES' PATENT OFFICE l 2,333,233 vToor.

' Herbert Bold, cleveland, ohio vApplicationspin 4, 1942, serial No.431.657

\ (ci. 'zr-ss) 7 claims.

This invention relates to a tool particularly adapted for cutting awayor boring metal forming the inner wall of a. hole, cavity, cylinder andthe like, whereby the diameter of a hole may be enlarged or annuallyrecessed, the inner wall oi a cavity or cylinder may be grooved orenlarged from end to end or intermediate its ends or the end wall of ahole,`cavity or cylinder cambered or beveled.

In tools for carrying out operations ci this character, or" which 1 haveknowledge, the' cutting element was adjusted by a cut-and-try method;that is, the cutter element was manually engaged and moved endwise andthen secured in its adjusted position, and then the operative would testthe tool with a work piece or attempt to measure its position. This sortoi construction would often require several ad iustment operations, andwhen iinally adjusted the operative was compelled to carry out the -fintended operation, at least partially, to determine the accuracy of theadjustment. In tools of this form of construction and method ofadjustme'nt, very often one or more work-pieces were ruined 'and hencewasted. In making ad Justments of this character, the setting of thecutting element 7cecoxnes largely a matter oi guess'-worlt, so thatwhere the work pieces must he finished in accordance with exact specieddimensions, great danger of inaccuracy occur ring is present; also, whentwo or more tools are being employed on work pieces of like characterdanger of non-uniformity of the finished pieces is also present.

One object of the invention is to provide an improved tool of this typehaving micrometer adjustment ineens, whereby the cutting element may headjusted predetermined distances scv cording to specified dimensions atthe will oi the operative, whereby work pieces may he propa erly nishedand danger of non-uniformity eluni-` noted.

relates from the following description taken in,

connection with the accompanying drawing,

wherein 1 Figi l is a viewLpartlyin section, 'oi a tool embodyingmyinvention.'

Fig. 2 is a fragmentary bottom plan view.

Figs. 3 and 4 are sections on the lines 3-3 and respectively o'f Fig. 2.

Figs. 5 and 6 are perspective views of details.

Fig. 'i is a fragmentary view, partly in section, showing a modifiedform of construction.

in the drawingr i indicates as an entirety a shank, provided at itsouter end with a cutting element 2 mounted as hereinafter set forth. The

inner end of the shank i is shaped to be rigidly, but removably mountedin a clamping device (not shown) provided on a driven spindle or shaftin relation to a support or bed for the work-piece to bev operated upon.The clamping device, spindle or shaft and support or bed are not shownas they form no part of the present invention and may loe of standard orspecial construction. The

- shank. i, inwardly-of its outer end, is circumfer- Another object of'the invention is to provide entially reduced, as shown at 3 to form abearing tor the inner end portion of a-rotatable sleeve il and ashoulder fia against which the inner end of the sleeve bears. The shanki, outwardly of the hearing 3, is reduced circumferentially as shown atE5, relative to the bearing 3 for a purpose lar set forth. 6 indicates.a collar surrounding the reduced portion 5 of the shank and ilned`thereto preferably by a countersunl: set screw l, The inner end or thecollar forms a shoulder Cia against which the outer end of the sleeve ibears, the shoulders da, da, serving to prevent movement of -the sleeveaxially of the shank during its rotation. The inner wall ofthe collar tadjacent its inner end is recessed, as

shown at 55h, for a purpose later set forth. Aty

one side, the reduced portion 5 of the shank i is rornied with alongitudinally extending slot t, of non-circular shape in cross section,the walls of which form guides for a thrust member il, arranged. to loemoved endwise therein. The guide slot d preferably terminates inwardlyof the outer end ofthe shank i for a purpose later set forth. The outerend of the thrust member il is inclined or beveled from its inner sideoutwardly, as shown at da, for engagement with the inner end of thecutting element 2, whereby outward movement of the Athrust member 9 iseffective to move the cutting element 2 c ndwise outwardly. The thrustmember S is extended inwardly into overlapping relation to the sleeve dand is operatively con nected to the latter, as later set forth, wherebyrotation oi the sleeve serves to eifect endwise movement of the thrustmember 8. The cutting element 2 is slidably and removably mounted in anelongated/through opening I8 formed in the end portion of the shank I,the inner end oi' the opening I8 merging into the guide. slot 8 so as toprovide for the engagement of the cutting element by the outer beveledend of the thrust member'e and extending diametrically to the oppositeside of the shank I. In the form of construction shown in Figs. 1, 2 and5, the opening I8 extends in an outwardly inclined direction, at anangle of substantially 53 degrees relative to the axis of the shank I,so as to position the outer end of the cutting element 2 opposite theouter end of the shank I. In this arrangement, the inner end of thecutting element 2 is preferably disposed at right angles to its axis andthe beveled end 8a of the thrust member 8 is preferably inclined at thesame or complementary angle relative to the f axis of the shank I as theopening III. Where the opening for the cutting element 2 is disposeddiametrically at right angles to the axis of the shank I, as shown at I8in Fig. 7, the inner end of the cutting element 2 is beveled preferablyat an angle of 45 to its axis, and the end 8a of the thrust member 8 iscorrespondingly beveled.

By preference the collar 8 extends to a point adjacent the outer end ofthe shank I to close the guide slot 8 at its outer end and to maintaining I8.

The outer end of the shank I outwardly of the opening I0 o1' I0' isformed with a threaded v opening II disposed at right angles to theopening I 0 or III' and extending at its inner end thereinto andarranged to receive a countersunk set screw I2 which may be tightenedagainst the cutting element 2 to rigidly secure it in its adjustedposition. By terminating the guide slot 8 inwardly of the outer end ofthe shank I, such end is closed to exclude grease, oil, circulating duidand metal chips from the slot 8 and suflicient metal is provided forforming the openings III or In' and II and inserting a relatively largeset screw In the latter.

The inner wall of the sleeve 4, from its outer end inwardly throughout aportion of its length is provided with screw threads Il and the outerside of the thrust member 8 is correspondingly threaded, as shown at I4for engagement with the screw threads I8, so that by rotating the sleeve4, which is held against endwise movement by the shoulders 4a, 8a,endwise movement is imparted to the thrust member 8.

It will be observed that the screw threads I3. I4, have a, predeterminedpitch relative to the inclination of the co-acting engaging ends betweenthe thrust member 8 and cutting element 2, whereby rotation of thesleeve 4 a predetermined distance will eilfect a predetermined endwisemovement of the thrust member 8 and the latter in turn will adjust thecutting element 2 a predetermined distance outwardly. By reason of theco-ordinated relationships between these parts, designated graduationsII, preferably in thousandths of an inch, on the sleeve 4 and movablerelative to a fixed mark I8 on the shank I, serve to indicate to theoperative the amount of adjustment of the cutting element 2, which willresult from each rotation or partial rotation of the sleeve 4; he isthus enabled to readily determine the necessary angular movement of thesleeve for any desired adjustment of thelcutting element and to eil'ectsuch adjustment accurately.

The recess 8b accommodates the scre'fw threads I 4 when the thrustmember 8 is moved outwardly, whereas the reduced portion l of the shankI accommodates the screw threads I8, being engaged thereby to form abearing for the cuter end portion of the sleeve.

I1 indicates a through opening formed in the shank I and extendingdiametrically thereof and at an inclined angle from a point inwardly ofthe sleeve 4 to a point outwardlyl of the inner end of the latter, so asto merge with the reduced or bearing portion 8. 'I'he inner end portionof the opening II slidably supports a plunger I8 arranged to engage theinner wall of the sleeve 4. The walls of the outer endportion of theopening II are provided with screw threads tov take a set screw I8,arranged to engage the outer end of the plunger I8 and when tightenedagainst the latter it clamps the plunger I8 against the sleeve 4 to'prevent its rotation. Y

By preference, the guide slot 8 extends inwardly beyond the reducedportion l to insure clearance.

To position the parts for operation, the sleeve 4 is rotated in thatdirection to move the thrust member 8 inwardly approximately to thelimit of its movement, then the cutting element 2 is inserted in itsseat or supporting opening III with its inner end against the collar 8,and then the sleeve 4 is rotated in the opposite direction until the 0graduation I5 on the sleeve 4 coincides with the mark I8 on the shank I,which coincidence indicates that the thrust member 9 is set in position,that is, in engagement with the inner end of the cutting element 2,ready to adjust the latter outwardly in accordance with movement of thesleeve 4 relative to the mark I8.

From the foregoing description it will be noted that the cutting element2 is capable of adjustment to effect precision cuts or' boringoperations and is also removable so that cutting elements of varyinglengths may be employed dependent upon the size of the opening in vwhichthe tool is to operate and other conditions.

To those skilled in the art to which my invenshank the outer sideofwhich is formed with a longitudinally extending slot, a thrust memberslidably mounted in said slot and provided on its outer side with screwthreads, a diametrically extending seat formed in the outer end yportionof said shank and communicating at its inner end with said slot, acutting element slidably mounted in said seat with its inner end in thepath of movement of said thrust member, said thrust member and the innerend of said cutting e element having co-acting surfaces, whereby endwiseoutward movement of said' thrust member serves to adjust said cuttingelement relative to the axis of said shank, inner and outer sleevessurrounding said shank in end-to-end relation and arranged to formA theouter wall for said slot, and means for securing said outer sleeve tosaid shank, said inner sleeve being rotatable on said shank and providedon its inner wall with screw threads arranged to engage the screwthreads on said thrust member to move the latter endwise.

2. A tool as claimed in claim 1, wherein means are provided on saidshank outwardly of said seat for iixedly securing said cutting elementto said shank in its adjusted position.

3. A tool as claimed in claim l, wherein means are provided on saidshank inwardly of said slot for positively locking said inner sleeveagainst movement.

4. A tool as claimed in claim 1, wherein means are provided on saidshank outwardly of said seat for xedly securing said cutting element tosaid shank in its adjusted position and separate means are providedinwardly of said cutting element fo securing said outer sleeve to saidshank.

5. A`too1 of the class described comprising` .a shank formed in its sidewall with a longitudinally extending slot, a thrust member slidablysupported in said slot and provided on its outer side with screwthreads, a cutting element slidably mounted in the outer end portion ofsaid shank and arranged to be engaged at its inner end by the outer endof said thrust member and moved endwise upon movement of said thrustmember in one direction, a sleeve the inner end portion of which extendsinwardly beyond said slot and rotatably fits said shank, and means onthe outer end portion of said shank for preventing endwise movement ofsaid sleeve during rotation thereof, the outer portion of said sleevebeing provided internally with screw threads arranged to engage thethreads on said thrust member and operable when rotated to move thelatter endwise.

6. A tool of the class described comprising a shank the outer side ofwhich is formed intermediate its ends with a longitudinally extendingslot, a thrust member slidably mounted in said slot and provided on itsouter side with screw threads, said thrust member having a cross sectionequal to that of said slot, a cutting element adjustably mounted in theouter end portion of said shank, and arranged to be engaged by the outerend of said thrust member and adjusted relative to the axis of saidshank, a sleeve surrounding said shank, the inner end portion of saidsleeve rotatably fitting said shank and the outer portion thereof beingprovided internally with screw threads in engagement with the threads onsaid thrust member, and means for holding said sleeve against endwisemovement, whereby rotation thereof moves said thrust member endwise.

'7. A tool of the class described, comprising a shank having a reducedouter end portion forming an annular shoulder inwardly of its outer end,the side wall of said reduced portion intermediate its ends being formedwith a longitudinally extending recess and adjacent its outer end saidportion being formed with a diametrically extending openingleading intosaid recess intermediate the ends thereof and forming a seat forslidably supporting a cutting element, .inner and outer sleeves disposedin end-to-end relation and tting the reduced portion of said shank, the

inner end of said inner sleeve abutting said shoulder and the outer endof said outer sleeve engaging said shank outwardly of said opening,whereby said sleeves form the outer wall of and close said recess, meansinwardly of said opening for securing said outer sleeve to said shank,separate means outwardly of said opening adapted to secure the cuttingelement in said opening, and a thrust member slidably fitting saidrecess and arranged to engage the inner end of the cutting element, theouter side of said thrust member and the inner wall of said innersleevevbeing provided with screw threads in threaded engagement, wherebyrotation of said inner sleeve on said shank moves said thrust memberendwise to adjust the cutting element.

. HERBERT BOLD.

